If you lie to your boss, you are digging your own grave.
dig one's own grave
idiomTo behave in a way that is likely to cause one to lose or fail, including, but not limited to, result in death.
By ignoring all the safety warnings at work, he is really digging his own grave.
The politician knew that by insulting his most loyal supporters, he was effectively digging his own grave before the upcoming election.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.